CN116683142A - Spiral corrugated copper pipe outer conductor radio frequency coaxial cable and manufacturing method thereof - Google Patents
Spiral corrugated copper pipe outer conductor radio frequency coaxial cable and manufacturing method thereof Download PDFInfo
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- CN116683142A CN116683142A CN202210163073.7A CN202210163073A CN116683142A CN 116683142 A CN116683142 A CN 116683142A CN 202210163073 A CN202210163073 A CN 202210163073A CN 116683142 A CN116683142 A CN 116683142A
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- copper pipe
- outer conductor
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- pipe outer
- conductor
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- 239000004020 conductor Substances 0.000 title claims abstract description 202
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 171
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 170
- 239000010949 copper Substances 0.000 title claims abstract description 170
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000005187 foaming Methods 0.000 claims abstract description 72
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 239000003292 glue Substances 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims description 56
- 239000000463 material Substances 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000012212 insulator Substances 0.000 claims description 18
- 239000002667 nucleating agent Substances 0.000 claims description 18
- 229920001684 low density polyethylene Polymers 0.000 claims description 16
- 239000004702 low-density polyethylene Substances 0.000 claims description 16
- 238000004049 embossing Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 14
- 229920003023 plastic Polymers 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 229920001903 high density polyethylene Polymers 0.000 claims description 13
- 239000004700 high-density polyethylene Substances 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 13
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 12
- 239000004698 Polyethylene Substances 0.000 claims description 12
- 239000003063 flame retardant Substances 0.000 claims description 12
- -1 polyethylene Polymers 0.000 claims description 12
- 229920000573 polyethylene Polymers 0.000 claims description 12
- 229920000098 polyolefin Polymers 0.000 claims description 12
- 239000000779 smoke Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 10
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000005491 wire drawing Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 230000003511 endothelial effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims 2
- 238000005452 bending Methods 0.000 abstract description 11
- 239000010410 layer Substances 0.000 description 131
- 230000000052 comparative effect Effects 0.000 description 5
- 239000006260 foam Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 1
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical group NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/06—Coaxial lines
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
Landscapes
- Manufacturing Of Electric Cables (AREA)
Abstract
The invention relates to the technical field of cables, in particular to a radio frequency coaxial cable with a spiral corrugated copper pipe outer conductor and a manufacturing method thereof, wherein the radio frequency coaxial cable comprises an inner conductor, an inner skin layer, a foaming insulating layer, an outer skin layer, the spiral corrugated copper pipe outer conductor and a protective sleeve; the inner conductor is covered with an inner skin layer, the inner skin layer is covered with a foaming insulating layer, the foaming insulating layer is covered with an outer skin layer, the outer skin layer is covered with a spiral corrugated copper pipe outer conductor, and the spiral corrugated copper pipe outer conductor is covered with a protective sleeve; wherein, the outer skin layer is formed on the surface of the foaming insulating layer by adopting EVA glue to be uniformly extruded and coated by an extruder, the thickness of the outer skin layer is 0.03-0.08 mm, and the outer skin layer is bonded and connected with the outer conductor of the spiral corrugated copper pipe when being heated. According to the invention, the spiral corrugated copper pipe outer conductor radio frequency coaxial cable is far-pulled, and the foaming insulating layer between the inner conductor and the outer conductor cannot retract or loosen after bending, so that the electrical performance of the cable is improved.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a radio frequency coaxial cable with a spiral corrugated copper pipe outer conductor and a manufacturing method thereof.
Background
The radio frequency coaxial cable for mobile communication is mainly applied to an antenna feeder system as a main feeder and a branch feeder for transmitting and receiving. Because of instability factors in the process, the problem that an insulating layer is retracted and loosened between an inner conductor and an outer conductor after the cable is pulled out and bent is solved, so that the electrical performance of the cable is affected, and therefore research on the fact that the insulating layer between the inner conductor and the outer conductor after the cable is pulled out and bent is not retracted and loosened is needed, and the electrical performance of the cable is improved.
Disclosure of Invention
The invention aims to solve the technical problems that: the invention provides a radio frequency coaxial cable with a spiral corrugated copper pipe outer conductor, which aims to solve the problem that an insulating layer is retracted and loosened between the inner conductor and the outer conductor after being pulled far and bent. According to the invention, the spiral corrugated copper pipe outer conductor radio frequency coaxial cable is far-pulled, and the foaming insulating layer between the inner conductor and the outer conductor cannot retract or loosen after bending, so that the electrical performance of the cable is improved.
The technical scheme adopted for solving the technical problems is as follows: a radio frequency coaxial cable with a spiral corrugated copper pipe outer conductor comprises an inner conductor, an inner skin layer, a foaming insulating layer, an outer skin layer, the spiral corrugated copper pipe outer conductor and a protective sleeve; the inner conductor is coated with the inner lining layer, the inner lining layer is coated with the foaming insulation layer, the foaming insulation layer is coated with the outer skin layer, the outer skin layer is coated with the spiral corrugated copper pipe outer conductor, and the spiral corrugated copper pipe outer conductor is coated with the protective sleeve; the outer skin layer is formed on the outer surface of the foaming insulating layer by adopting EVA glue to be uniformly extruded and coated, the thickness of the outer skin layer is 0.03-0.08 mm, and when the outer skin layer is heated, the foaming insulating layer is bonded with the outer conductor of the spiral corrugated copper pipe through the outer skin layer.
Further, specifically, when the outer skin layer is heated, the spiral corrugated copper pipe outer conductor is heated by using a high-frequency inductor, and the outer skin layer is bonded and attached to the inner surface of the spiral corrugated copper pipe outer conductor.
Further, specifically, the inner conductor adopts a copper-clad aluminum wire, and the copper layer thickness of the copper-clad aluminum wire is 0.5% -3.5% of soft copper-clad aluminum wire.
Further, specifically, the inner lining layer is formed on the surface of the inner conductor by uniformly extruding and cladding after being mixed with EVA glue according to a proportion, and the thickness of the inner lining layer is 0.03-0.05 mm.
Further, specifically, the foamed insulating layer is an insulating layer formed by physically foaming polyethylene, a nucleating agent and a gas selected from CO 2 、N 2 And C 4 F 8 One or two gases in the gas-liquid mixture, and the foaming degree of the fully-closed air hole is 55-80%.
Further, specifically, the spiral corrugated copper pipe outer conductor adopts a copper strip, and the thickness of the copper strip is 0.11-0.35mm.
Further, specifically, the thread direction of the outer conductor of the spiral corrugated copper pipe is right, the outer surface of the outer conductor of the spiral corrugated copper pipe is provided with mutually alternating wave crests and wave troughs, and a pitch is formed between every two adjacent wave crests.
Further, the protective sleeve is a linear low-density polyethylene or low-smoke halogen-free flame-retardant polyolefin protective sleeve, and is uniformly extruded and coated on the surface of the outer conductor of the spiral corrugated copper pipe through a fifth extruder.
A method of making a spiral corrugated copper tube outer conductor radio frequency coaxial cable for making a spiral corrugated copper tube outer conductor radio frequency coaxial cable as described above, the method comprising the steps of:
step one, raw material detection: comprises the detection of the material of the inner conductor 1 and the material of the outer conductor 5 of the spiral corrugated copper pipe;
step two, the inner conductor is preprocessed: installing the inner conductor meeting the detection requirement in the first step on pay-off rack equipment, straightening by a straightener, drawing by a wire drawing die, and then entering a cleaning box for surface cleaning;
step three, extruding and wrapping the endothelial layer: coating the inner conductor treated in the second step with the inner lining layer, wherein the inner lining layer is prepared from low-density polyethylene and EVA glue according to the following steps (1-5): 1, heating the inner conductor after mixing according to a proportion, heating the inner conductor to 170-210 ℃, uniformly extruding and coating the inner conductor on the outer surface of the inner conductor through a first extruding machine, wherein the thickness of the inner conductor is 0.03-0.05 mm, cooling the inner conductor after the extrusion and coating of the inner conductor on the outer surface of the inner conductor is finished by adopting a water cooling method, and cooling the inner conductor coated with the inner conductor to 25-40 ℃;
step four, extruding and wrapping the foaming insulating layer and the outer skin layer: coating the foaming insulating layer and the outer skin layer outside the inner skin layer in the step three, wherein the foaming insulating layer is an insulating layer formed by physical foaming of polyethylene, a nucleating agent and gas, the polyethylene comprises high-density polyethylene and low-density polyethylene, and the weight percentages of the high-density polyethylene, the low-density polyethylene and the nucleating agent are respectively 64 percent of high-density polyethylene, 35 percent of low-density polyethylene and 1 percent of nucleating agent;
weighing high-density polyethylene, low-density polyethylene and a nucleating agent according to a proportion, heating to a molten state in a second extruder to form a molten insulator, controlling the temperature of the second extruder to be 200 ℃, injecting the gas into the molten insulator through a gas injection hole on the second extruder under the action of a pressure pump, then conveying the molten insulator injected with the gas to a third extruder, controlling the temperature of the third extruder to be 140 ℃, mixing the insulator injected with the gas in the third extruder to form a supersaturated gas mixture, conveying the inner conductor coated with the inner skin layer in the third step to a die opening of the third extruder, extruding and coating the gas mixture on the surface of the inner skin layer through a die head of the third extruder to form a foaming insulating layer, forming a double-layer co-extrusion structure through the die head of the third extruder, simultaneously adopting EVA glue, heating the EVA glue to 160-190 ℃ in the fourth extruder, extruding the EVA glue to form a foam layer through the die head of the third extruder, drying the EVA glue to form a foam layer through a foam layer at the temperature of the die head of the third extruder to be 35-35 ℃ after the EVA glue is heated, and finally drying the EVA glue layer through a cooling device, and drying the EVA layer through a drying gradient, and forming the insulating layer through a cooling groove to be dried;
fifthly, manufacturing the spiral corrugated copper pipe outer conductor: the copper strip meeting the requirements is placed on a strip placing frame by the copper strip, the copper strip is conveyed to a finish cutting device after being cleaned, the edge of the copper strip is cut off by a high-precision cutter to ensure that the width of the copper strip is consistent, the copper strip after finish cutting is conveyed to forming equipment, the forming equipment forms the copper strip after finish cutting into a round tubular shape with upward seam and close connection, and longitudinally wraps the inner conductors of the foaming insulating layer and the outer skin layer in the fourth step, then the seam is welded by a welding unit by adopting an automatic argon arc welding technology to form a closed smooth copper pipe outer conductor, the smooth copper pipe outer conductor is drawn by a wire drawing die for two times, a gap is formed between the smooth copper pipe outer conductor and the outer skin layer, the outer diameter of the smooth copper pipe outer conductor after drawing is smaller than the outer diameter of the smooth copper pipe outer conductor before drawing, a drawing device controls the speed of the smooth copper pipe outer conductor entering a embossing device after drawing, the drawing device gives pressure to the smooth copper pipe outer conductor and the inner conductor extruded with the foaming insulating layer and the outer skin layer in the fourth step, and simultaneously an embossing blade on the embossing device is embossed on the smooth copper pipe outer conductor by controlling the rotating speed of the embossing device, the smooth copper pipe outer conductor is embossed into a spiral corrugated copper pipe outer conductor with a spiral direction being right, and the thickness of the copper strip is 0.11-0.35mm;
heating the outer conductor of the spiral corrugated copper pipe by using the high-frequency inductor, controlling the temperature of the high-frequency inductor to be 160-180 ℃, completely bonding the outer skin layer with the copper strip inner layer at the trough of the outer conductor of the spiral corrugated copper pipe under the heating condition, and cooling after the heating is finished;
step six, extruding and wrapping the protective sleeve, wherein the protective sleeve material adopts linear low-density polyethylene sheath material or low-smoke halogen-free flame-retardant polyolefin, the linear low-density polyethylene sheath material or low-smoke halogen-free flame-retardant polyolefin is dried by a drying device and melted in a fifth extruding machine, the melted polyethylene sheath material or low-smoke halogen-free flame-retardant polyolefin sheath material is extruded and wrapped on the spiral corrugated copper pipe outer conductor in the step five through a sheath extruding die head, the manufacturing of the protective sleeve is completed, then the protective sleeve is cooled through a hot water tank with the temperature of 40 ℃, and then the protective sleeve is cooled through a cold water tank with the temperature of normal temperature, so that the spiral corrugated copper pipe outer conductor radio-frequency coaxial cable is manufactured;
and step seven, detecting a finished product, namely detecting the radio frequency coaxial cable of the outer conductor of the spiral corrugated copper pipe manufactured in the step six, wherein main electrical parameters of the test comprise an attenuation constant and a voltage standing wave ratio.
Further, in particular, the gas in the fourth step is selected from CO 2 、N 2 And C 4 F 8 The gas in the liquid form is stored in the injector, after the pressure of the pressure pump is increased to 120bar, the gas in the liquid form is extruded and injected into the molten insulator from the gas injection hole of the second plastic extruding machine through the needle valve of the injector, the temperature of the second plastic extruding machine is controlled to be 200 ℃, the gas in the liquid form is gasified at high temperature to form gas in the gaseous state, and the gas injection amount of the gas is controlled by adjusting the pressure value to 150-160 bar.
The invention has the beneficial effects that the outer skin layer is bonded and connected with the outer conductor of the spiral corrugated copper pipe by adopting EVA glue, the bonding force is good, after the radio frequency coaxial cable of the outer conductor of the spiral corrugated copper pipe is pulled far and bent, the bonding and connection between the foaming insulating layer and the outer conductor of the spiral corrugated copper pipe by the outer skin layer are not easy to loosen and fall off, the foaming insulating layer is not easy to retract, the bending performance of the cable is improved, and various index performances of the cable are ensured. In addition, the electrical performance parameters of the cable are better than those of similar products after bending.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a cross-sectional view of a preferred embodiment of the present invention.
Fig. 2 is a schematic structural view of a preferred embodiment of the present invention.
1, an inner conductor; 2. an endothelial layer; 3. foaming the insulating layer; 4. an outer skin layer, 5, a spiral corrugated copper pipe outer conductor; 6. a protective sleeve; 51. a peak; 52. wave trough.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
1-2, which are the preferred embodiments of the present invention, a radio frequency coaxial cable with a spiral corrugated copper pipe outer conductor, comprises an inner conductor 1, an inner lining layer 2, a foaming insulation layer 3, an outer skin layer 4, a spiral corrugated copper pipe outer conductor 5 and a protective sleeve 6; the inner conductor 1 is externally coated with an inner skin layer 2, the inner skin layer 2 is externally coated with a foaming insulating layer 3, the foaming insulating layer 3 is externally coated with an outer skin layer 4, the outer skin layer 4 is externally coated with a spiral corrugated copper pipe outer conductor 5, and the spiral corrugated copper pipe outer conductor 5 is externally coated with a protective sleeve 6.
The inner conductor 1 adopts a copper-clad aluminum wire, and the thickness of a copper layer of the copper-clad aluminum wire is 0.5% -3.5% of soft copper-clad aluminum wire.
The inner skin layer 2 is formed on the surface of the inner conductor 1 by uniformly extruding and cladding after being mixed with the EVA glue according to the proportion, and the thickness of the inner skin layer 2 is 0.03-0.05 mm.
The foamed insulating layer 3 is an insulating layer formed by physical foaming of polyethylene, a nucleating agent and a gas selected from CO 2 、N 2 And C 4 F 8 One or two gases in the gas-liquid mixture, and the foaming degree of the fully-closed air hole is 55-80%. The fully-closed air holes are fine dense cells, each cell is of a closed structure, and the problem of large cells or perforation is avoided. The signal transmission is mainly carried out in the cable core of the cable, and the higher the foaming degree is, the better the transmission rate is, and the higher the attenuation performance of the cable is.
The outer skin layer 4 is uniformly extruded and coated on the surface of the foaming insulating layer 3 by EVA glue, the thickness of the outer skin layer 4 is 0.03-0.08 mm, when the outer skin layer 4 is heated, the foaming insulating layer 3 is bonded and connected with the spiral corrugated copper pipe outer conductor 5 through the outer skin layer, the bonding force is good, after the radio-frequency coaxial cable of the spiral corrugated copper pipe outer conductor is pulled far and bent, the foaming insulating layer 3 and the spiral corrugated copper pipe outer conductor 5 are bonded and connected through the outer skin layer 4, and the foaming insulating layer is not easy to loosen and fall off. When the skin layer is heated, the spiral corrugated copper pipe outer conductor is heated by the high-frequency inductor, so that the skin layer is bonded and connected with the inner surface of the spiral corrugated copper pipe outer conductor 5, the spiral corrugated copper pipe outer conductor 5 can be uniformly heated by the high-frequency inductor, the outer surface of the skin layer 4 can be better bonded and attached to the inner surface of the spiral corrugated copper pipe outer conductor 5, and the holding force between the skin layer 4 and the spiral corrugated copper pipe outer conductor 5 is better.
The spiral corrugated copper pipe outer conductor 5 adopts a copper strip, and the thickness of the copper strip is 0.11-0.35mm. The screw thread direction of the spiral corrugated copper pipe outer conductor 5 is right, and the right spiral meets standard regulation, so that the cable is consistent in orientation and is convenient to connect with an interface. The outer surface of the spiral corrugated copper pipe outer conductor 5 is provided with mutually alternating wave crests and wave troughs, and a pitch is formed between every two adjacent wave crests. In order to facilitate the matching connection of the cable and the interface, the outer diameter of the wave crest is 12.10mm, the outer diameter of the wave trough is 9.60mm, and the distance of the pitch S is 3.25mm.
The protective sleeve 6 is a linear low density polyethylene or low smoke zero halogen flame retardant polyolefin protective sleeve, and is uniformly extruded and coated on the surface of the outer conductor 5 of the spiral corrugated copper pipe through a fifth extruder.
The manufacturing method of the radio frequency coaxial cable with the spiral corrugated copper pipe outer conductor is used for manufacturing the radio frequency coaxial cable with the spiral corrugated copper pipe outer conductor, and comprises the following steps of:
step one, raw material detection: including the detection of the material of the inner conductor 1 and the material of the outer conductor 5 of the spiral corrugated copper tube. Detecting a copper-clad aluminum wire adopted by the material of the inner conductor 1, and detecting whether the copper-clad aluminum wire meets the requirement, namely the thickness of the copper-clad aluminum wire; the material for detecting the outer conductor 5 of the spiral corrugated copper pipe adopts a copper strip, and whether the copper strip meets the requirements, namely the width and the thickness of the copper strip is detected.
In step one, it is also included to check whether the liquid gas material meets the requirements, i.e. whether the purity value of the liquid gas reaches 99.99%.
Step two, pretreatment of the inner conductor 1: and (3) installing the inner conductor 1 meeting the detection requirement in the step one on pay-off rack equipment, straightening by a straightener to ensure no bending defect, drawing by a wire drawing die, and then entering a cleaning box to clean the surface, so as to clean copper powder and impurities on the surface and prevent the impurities from affecting the transmission performance on the surface of the copper pipe.
Step three, extruding and wrapping an inner skin layer 2: coating the inner conductor 1 treated in the second step with an inner skin layer 2, wherein the inner skin layer 2 is prepared from low-density polyethylene and EVA glue according to the following steps (1-5): 1, heating the inner conductor 1 after mixing the inner conductor 1 in proportion, heating the inner conductor 1 to 170-210 ℃, uniformly extruding and coating the inner conductor 2 on the outer surface of the inner conductor 1 by a first extruder, wherein the thickness of the inner conductor 2 is 0.03-0.05 mm, cooling the inner conductor 1 coated with the inner conductor 2 by a water cooling method after the extrusion coating of the outer surface of the inner conductor 1 is finished, and cooling the inner conductor 1 coated with the inner conductor 2 to 25-40 ℃, wherein the preferable cooling temperature is 40 ℃ in the embodiment of the invention, so that the contact part of the foaming layer and the inner conductor is prevented from generating large perforation, and the electric performance of the cable is influenced.
Step four, extruding and wrapping the foaming insulating layer 3 and the outer skin layer 4: the inner layer of the third step is coated with a foaming insulating layer 3 and an outer layer 4, the foaming insulating layer 3 is an insulating layer formed by physical foaming of polyethylene, a nucleating agent and gas, the polyethylene comprises high-density polyethylene and low-density polyethylene, the weight percentages of the high-density polyethylene, the low-density polyethylene and the nucleating agent are respectively 64 percent of high-density polyethylene, 35 percent of low-density polyethylene and 1 percent of nucleating agent, and the nucleating agent is modified azodicarbonamide nucleating agent
The high-density polyethylene, the low-density polyethylene and the nucleating agent are weighed according to the proportion, the mixture is heated to a molten state in a second extruder to form a molten insulator, the temperature of the second extruder is controlled at 200 ℃, so that the high-density polyethylene, the low-density polyethylene and the nucleating agent are quickly melted, gas is conveniently injected, gas is extruded and injected into the molten insulator through a gas injection hole on the second extruder, then the molten insulator injected with the gas is conveyed to a third extruder, the temperature of the third extruder is controlled at 140 ℃, the insulator injected with the gas is mixed in the third extruder to form a supersaturated gas-material mixture, the temperature of the third extruder is controlled to avoid that the molten insulator is too thin due to the too high temperature, the molten insulator is unfavorable for molding, and when the temperature is too low, the method comprises the steps of mixing and mixing insulators filled with gas uniformly, conveying an inner conductor 1 coated with an inner sheath layer 2 in the third step to a die opening of a third plastic extruding machine, extruding and coating a gas mixture on the surface of the inner sheath layer through a die head of the third plastic extruding machine to form a foaming insulating layer, wherein the die head of the third plastic extruding machine is of a double-layer co-extrusion structure, meanwhile, an outer sheath layer 4 is made of EVA glue, the temperature of the EVA glue is heated to 160-190 ℃ in a fourth plastic extruding machine, the heated EVA glue is extruded and coated on the foaming insulating layer through the die head of the third plastic extruding machine to form the outer sheath layer 4, then, the foaming insulating layer is subjected to gradient cooling through a hot water tank at 35-45 ℃ and a cold water tank at 15-25 ℃, shrinkage performance of a foaming cable core is reduced, cells are stable, the formed insulating layer is ensured to be crystallized, and finally, and a drying device is used.
In step four, the gas is selected from CO 2 、N 2 And C 4 F 8 Either or both of the gases are stored in a liquid form in an injector, after the pressure of the liquid form of the gas is increased to 120bar, the liquid form of the gas is extruded and injected into the molten insulator from the gas injection hole of a second extruder through the needle valve of the injector, the temperature of the second extruder is controlled at 200 ℃, and the liquid form of the gas is gasified at high temperature to form gaseous gas. Furthermore, the foaming degree of the foaming insulating layer is good by adjusting the pressure value to 150-160 bar to control the gas injection amount of the gas, and the extrusion amount of the third extrusion molding machine in production is adjusted, so that the outer diameter and capacitance of the foaming insulating layer meet the technological design requirements. In the actual production process, the extrusion amount of the third plastic extruding machine and the second plastic extruding machine are in a linkage state during the adjustment production, and the rotating speed of the second plastic extruding machine is correspondingly and automatically adjusted during the control of the third plastic extruding machine.
In the fourth step, key production parameters such as capacitance, cable core outer diameter, foaming degree, eccentricity, ellipticity and temperature of each area of the extruder are controlled so as to meet the standard. Further, the temperature of the extruder is controlled to melt the materials, and the materials with too high temperature are easy to have quality problems, and the materials are too thin to be easily molded during fusion, so that the problems of uneven melting and uneven mixing due to too low temperature are solved. Too high and too low temperatures can affect the foaming insulation layer to have large perforation quality problems in the foaming process, and affect the performance of the cable.
Step five, manufacturing a spiral corrugated copper pipe outer conductor 5: the copper strip which meets the requirements in the first step is placed by a tape placing frame, the copper strip is conveyed to a finish cutting device after being cleaned, the edge of the copper strip is cut off by a high-precision cutter, the width of the copper strip is consistent, welding is convenient, the finish-cut copper strip is conveyed to forming equipment, the finish-cut copper strip is formed into a tube seam upwards by the forming equipment, the tube seam is tightly connected and round, meanwhile, the tube seam is longitudinally wrapped on the inner conductors of the foaming insulating layer 3 and the outer skin layer 4 in the fourth step, then the tube seam is welded by adopting an automatic argon arc welding technology through a welding unit, a closed smooth copper tube outer conductor is formed, continuous welding is used during welding, a welding seam is tight, and defects of fusion holes, false welding and welding leakage quality are avoided.
After welding, the smooth copper pipe outer conductor is subjected to two-pass drawing through a wire drawing die, a gap is formed between the smooth copper pipe outer conductor and the outer skin layer 4 after drawing, the smooth copper pipe outer conductor and the outer skin layer 4 are not bonded together, the outer diameter of the smooth copper pipe outer conductor after drawing is smaller than that of the smooth copper pipe outer conductor before drawing, a drawing device controls the speed of the smooth copper pipe outer conductor entering a embossing device after drawing, the drawing device provides pressure between the smooth copper pipe outer conductor and the inner conductors of the step four extrusion foaming insulating layer 3 and the outer skin layer 4, simultaneously, an embossing blade on the embossing device is used for embossing on the smooth copper pipe outer conductor by controlling the rotating speed of the embossing device, the smooth copper pipe outer conductor is rolled into a spiral corrugated copper pipe outer conductor 5 with the right direction, and the thickness of a copper strip is 0.11-0.35mm.
And heating the outer conductor 5 of the spiral corrugated copper pipe by using a high-frequency inductor, controlling the temperature of the high-frequency inductor at 160 ℃, completely bonding and attaching the outer skin layer 4 and the inner copper strip layer at the trough of the outer conductor 5 of the spiral corrugated copper pipe in a heated state, and cooling after heating.
In step five, the embossing blade is preferably a single ring embossing blade.
Step six, extruding a protective sleeve 6: the material of the protective sleeve 6 is linear low-density polyethylene sheath material or low-smoke halogen-free flame-retardant polyolefin, the material is dried by a drying device, the material is melted in a screw rod of a fifth plastic extruding machine, the melted polyethylene sheath material or low-smoke halogen-free flame-retardant polyolefin sheath material is extruded on the spiral corrugated copper pipe outer conductor 5 in the step five through a sheath extrusion die head to complete the protective sleeve 6, and then the material is cooled through a hot water tank with the temperature of 40 ℃, and then cooled through a cold water tank with the temperature of normal temperature, so that the spiral corrugated copper pipe outer conductor radio-frequency coaxial cable is manufactured.
In the sixth step, when the linear low-density polyethylene sheath material is adopted for melting, the heating temperature is 195-230 ℃, and when the low-smoke halogen-free flame-retardant polyolefin is adopted for melting, the heating temperature is 160-185 ℃.
And step seven, detecting a finished product, namely detecting the radio frequency coaxial cable of the outer conductor of the spiral corrugated copper pipe manufactured in the step six, wherein main electrical parameters of the test comprise an attenuation constant and a voltage standing wave ratio.
Taking the embodiment as an example to test the radio frequency coaxial cable of the 50-9 spiral corrugated copper pipe outer conductor, the invention selects: the inner conductor 1 is a copper-clad aluminum wire with the diameter of phi 3.65 mm-10A; the thickness of the inner skin layer 2 is 0.05mm, the outer diameter of the foaming insulating layer 3 formed by physical foaming is 9.8mm, the outer skin layer 4 is an EVA adhesive layer, and the thickness of the outer skin layer 4 is 0.05mm; the thickness of the copper strip of the spiral corrugated copper pipe outer conductor 5 is 0.21mm, and the copper strip is longitudinally wrapped, welded under the protection of argon, drawn by multiple passes, embossed and formed and heated at high frequency; the protective sheath 6 is a linear low density polyethylene sheath. The outer diameter of the spiral corrugated copper pipe outer conductor 5 is 13.40mm, and the foaming insulating layer 3 adopts CO independently 2 The gas is foamed, and the foaming degree of the fully-closed air holes is 60%. And testing the voltage standing wave ratio. The above test is performed by a conventional test method in the art, and is not particularly limited herein. The test results are shown in Table 1.
The cables of the comparative examples were identical to the materials selected for the skin layers of the examples except that the examples used EVA glue instead of the original skin layers, and the manufacturing process was also different, and the test results of the comparative examples are shown in table 1.
The cable performance of the radio frequency coaxial cable of the spiral corrugated copper pipe outer conductor and the cable of the comparative example of the invention are measured, and the results are shown in the following table:
table 1 shows the results of the performance test of the RF coaxial cable with the outer conductor of the spiral corrugated copper pipe
From table 1, it can be seen that the standing-wave ratio after bending of the embodiment of the present invention is smaller than the voltage standing-wave ratio of the comparative example, and the standing-wave ratio after bending of the embodiment of the present invention is smaller than the voltage standing-wave ratio of the comparative example after bending of the cable for a plurality of times, so that the performance parameters of the embodiment of the present invention after bending are better than the electrical performance parameters of the similar products.
According to the invention, the EVA glue is adopted as the outer skin layer, the foaming insulating layer is bonded and connected with the outer conductor of the spiral corrugated copper pipe through the outer skin layer, the bonding force is good, after the radio frequency coaxial cable of the outer conductor of the spiral corrugated copper pipe is pulled far and bent, the foaming insulating layer 3 and the outer conductor 5 of the spiral corrugated copper pipe are bonded and connected through the outer skin layer 4, so that the foaming insulating layer is not easy to loosen and fall off, and is not easy to retract, the bending performance of the cable is improved, and various index performances of the cable are ensured. In addition, the electrical performance parameters of the cable are better than those of similar products after bending.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (10)
1. A spiral corrugated copper pipe outer conductor radio frequency coaxial cable, characterized in that: comprises an inner conductor (1), an inner lining layer (2), a foaming insulating layer (3), an outer skin layer (4), a spiral corrugated copper pipe outer conductor (5) and a protective sleeve (6);
the inner conductor (1) is externally coated with the inner lining layer (2), the inner lining layer (2) is externally coated with the foaming insulation layer (3), the foaming insulation layer (3) is externally coated with the outer skin layer (4), the outer skin layer (4) is externally coated with the spiral corrugated copper pipe outer conductor (5), and the spiral corrugated copper pipe outer conductor (5) is externally coated with the protective sleeve (6);
the outer skin layer (4) is uniformly extruded and coated on the outer surface of the foaming insulating layer (3) by EVA glue, the thickness of the outer skin layer (4) is 0.03-0.08 mm, and when the outer skin layer (4) is heated, the foaming insulating layer (3) is bonded and connected with the spiral corrugated copper pipe outer conductor (5) through the outer skin layer (4).
2. The spiral corrugated copper pipe outer conductor radio frequency coaxial cable of claim 1, wherein: and when the outer skin layer (4) is heated, the spiral corrugated copper pipe outer conductor (5) is heated by using a high-frequency inductor, and the outer skin layer (4) is bonded and attached to the inner surface of the spiral corrugated copper pipe outer conductor (5).
3. The spiral corrugated copper pipe outer conductor radio frequency coaxial cable of claim 1, wherein: the inner conductor (1) is a copper-clad aluminum wire, and the copper layer thickness of the copper-clad aluminum wire is 0.5% -3.5% of soft copper-clad aluminum wire.
4. The spiral corrugated copper pipe outer conductor radio frequency coaxial cable of claim 1, wherein: the inner layer (2) is formed on the surface of the inner conductor (1) by uniformly extruding and coating after being mixed with EVA glue according to a proportion, and the thickness of the inner layer (2) is 0.03-0.05 mm.
5. The spiral corrugated copper pipe outer conductor radio frequency coaxial cable of claim 1, wherein: the foamed insulating layer (3) is an insulating layer formed by physical foaming of polyethylene, a nucleating agent and a gas selected from CO 2 、N 2 And C 4 F 8 One or two gases in the gas-liquid mixture, and the foaming degree of the fully-closed air hole is 55-80%.
6. The spiral corrugated copper pipe outer conductor radio frequency coaxial cable of claim 1, wherein: the spiral corrugated copper pipe outer conductor (5) adopts a copper strip, and the thickness of the copper strip is 0.11-0.35mm.
7. The spiral corrugated copper pipe outer conductor radio frequency coaxial cable of claim 6, wherein: the screw thread direction of the spiral corrugated copper pipe outer conductor (5) is right, the outer surface of the spiral corrugated copper pipe outer conductor (5) is provided with mutually alternate wave crests and wave troughs, and a pitch is formed between every two adjacent wave crests.
8. The spiral corrugated copper pipe outer conductor radio frequency coaxial cable of claim 1, wherein: the protective sleeve (6) is formed on the surface of the spiral corrugated copper pipe outer conductor (5) by adopting a linear low-density polyethylene or low-smoke halogen-free flame-retardant polyolefin sheath to be uniformly extruded and coated.
9. A manufacturing method of a spiral corrugated copper pipe outer conductor radio frequency coaxial cable is characterized by comprising the following steps: a method for making a spiral corrugated copper tube outer conductor radio frequency coaxial cable as defined in any one of claims 1-8, said method comprising the steps of:
step one, raw material detection: comprises the detection of the material of the inner conductor (1) and the material of the outer conductor (5) of the spiral corrugated copper pipe;
step two, the inner conductor (1) is preprocessed: installing the inner conductor (1) meeting the detection requirement in the first step on pay-off rack equipment, straightening by a straightener, drawing by a wire drawing die, and then entering a cleaning box for surface cleaning;
step three, extruding and wrapping the endothelial layer (2): coating the inner conductor (1) treated in the second step with the inner lining layer (2), wherein the inner lining layer (2) is prepared from low-density polyethylene and EVA glue according to the following steps (1-5): 1, heating after mixing according to a proportion, heating to 170-210 ℃, uniformly extruding and coating the inner lining layer (2) on the outer surface of the inner conductor (1) through the first extruding machine, wherein the thickness of the inner lining layer (2) is 0.03-0.05 mm, cooling by adopting a water cooling method after the extrusion and coating of the inner lining layer (2) on the outer surface of the inner conductor (1) are completed, and cooling the inner conductor (1) coated with the inner lining layer (2) to 25-40 ℃;
step four, extruding and wrapping the foaming insulating layer (3) and the outer skin layer (4): coating the foaming insulation layer (3) and the outer skin layer (4) on the inner skin layer in the third step, wherein the foaming insulation layer (3) is an insulation layer formed by physical foaming of polyethylene, a nucleating agent and gas, the polyethylene comprises high-density polyethylene and low-density polyethylene, and the weight percentages of the high-density polyethylene, the low-density polyethylene and the nucleating agent are respectively 64 percent of high-density polyethylene, 35 percent of low-density polyethylene and 1 percent of nucleating agent;
weighing high-density polyethylene, low-density polyethylene and a nucleating agent according to a proportion, heating to a molten state in a second extruder to form a molten insulator, controlling the temperature of the second extruder to be 200 ℃, injecting the gas into the molten insulator through a gas injection hole on the second extruder by a syringe, then conveying the molten insulator injected with the gas to a third extruder, controlling the temperature of the third extruder to be 140 ℃, mixing and mixing the insulator injected with the gas in the third extruder to form a supersaturated gas mixture, conveying the inner conductor (1) coated with the inner skin layer (2) in the third step to a die opening of the third extruder, extruding and coating the gas mixture on the surface of the inner skin layer through a die head of the third extruder to form a foaming insulating layer, heating the outer skin layer (4) to 160 ℃ by adopting EVA in a fourth extruder, connecting the die head of the fourth extruder with the die head of the EVA to 190 ℃, drying by blowing and drying by blowing through a cooling device (35 ℃ to be 35)), and finally forming a foaming insulating layer by cooling and drying the outer skin layer (45 ℃ by cooling by a cooling device;
fifthly, manufacturing the spiral corrugated copper pipe outer conductor (5): the spiral corrugated copper pipe outer conductor (5) is made of copper strips, the copper strips meeting the requirements in the first step are placed by a tape placing rack, the copper strips are conveyed to a finish cutting device after being cleaned, edges of the copper strips are cut off by a high-precision cutter to enable the widths of the copper strips to be consistent, the copper strips after finish cutting are conveyed to forming equipment, the forming equipment forms the copper strips after finish cutting into round tubes with upward tube seams and tight connection, meanwhile, longitudinal wrapping is performed on the inner conductors of the foaming insulating layer (3) and the outer skin layer (4) in the fourth step, then the tube seams are welded by adopting an automatic argon arc welding technology through a welding unit to form a closed smooth copper pipe outer conductor, the smooth copper pipe outer conductor is drawn twice through a wire drawing die, a gap is formed between the smooth copper pipe outer conductor and the outer skin layer (4), the outer diameter of the smooth copper pipe outer conductor after drawing is smaller than the outer diameter of the smooth copper pipe outer conductor before drawing, a drawing device controls the speed of the smooth copper pipe outer conductor entering a embossing device after drawing, the drawing device provides pressure for the smooth copper pipe outer conductor and the inner conductor extruded with the foaming insulating layer (3) and the outer skin layer (4) in the step four, and simultaneously, an embossing blade on the embossing device is embossed on the smooth copper pipe outer conductor by controlling the rotating speed of the embossing device, the smooth copper pipe outer conductor is embossed into a spiral corrugated copper pipe outer conductor (5) with the spiral direction being right, and the thickness of the copper strip is 0.11-0.35mm;
heating the spiral corrugated copper pipe outer conductor (5) by using the high-frequency inductor, wherein the temperature of the high-frequency inductor is controlled to be 160-180 ℃, the outer skin layer (4) is completely bonded with the copper strip inner layer at the trough of the spiral corrugated copper pipe outer conductor (5) under the condition of heating, and cooling treatment is carried out after heating is finished;
step six, extruding and wrapping the protective sleeve (6), wherein the material of the protective sleeve (6) adopts linear low-density polyethylene sheath material or low-smoke halogen-free flame-retardant polyolefin, the linear low-density polyethylene sheath material or low-smoke halogen-free flame-retardant polyolefin is dried by a drying device and melted in a fifth extruding machine, the melted polyethylene sheath material or low-smoke halogen-free flame-retardant polyolefin sheath material is extruded and wrapped on the spiral corrugated copper pipe outer conductor (5) in the step five through a sheath extruding die head, the manufacture of the protective sleeve (6) is completed, and then the protective sleeve is cooled through a hot water tank with the temperature of 40 ℃, and then cooled through a cold water tank with the temperature of normal temperature, so that the spiral corrugated copper pipe outer conductor radio-frequency coaxial cable is manufactured;
and step seven, detecting a finished product, namely detecting the radio frequency coaxial cable of the outer conductor of the spiral corrugated copper pipe manufactured in the step six, wherein main electrical parameters of the test comprise an attenuation constant and a voltage standing wave ratio.
10. The method for manufacturing the radio frequency coaxial cable with the spiral corrugated copper pipe outer conductor according to claim 9, wherein the method comprises the following steps: the gas in the fourth step is selected from CO 2 、N 2 And C 4 F 8 The gas in the liquid form is stored in the injector, after the pressure of the pressure pump is increased to 120bar, the gas in the liquid form is extruded and injected into the molten insulator from the gas injection hole of the second plastic extruding machine through the needle valve of the injector, the temperature of the second plastic extruding machine is controlled to be 200 ℃, the gas in the liquid form is gasified at high temperature to form gaseous gas, and the gas injection amount of the gas is controlled by adjusting the pressure value to 150-160 bar.
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| CN202210163073.7A CN116683142A (en) | 2022-02-22 | 2022-02-22 | Spiral corrugated copper pipe outer conductor radio frequency coaxial cable and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210163073.7A CN116683142A (en) | 2022-02-22 | 2022-02-22 | Spiral corrugated copper pipe outer conductor radio frequency coaxial cable and manufacturing method thereof |
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